Ohio
Butler County drinking water quality
21 active public water systems serve 378,589 people in Butler County. 9 are compliant, 12 had at least one EPA violation in the past three years, 1 is a designated serious violator, and 0 carry a health flag.
Needs attention
Community water systems
12 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Butler Co. Water District 2 PWS |
116,572 | 1 | 0 | |
|
Hamilton Public Water System |
62,447 | 2 | 1 | |
|
Middletown City PWS |
51,229 | 2 | 1 | |
|
Fairfield City PWS |
44,907 | 0 | 0 | |
|
Southwest Regional Water District |
42,856 | 0 | 0 | |
|
Oxford City PWS |
24,000 | 0 | 0 | |
|
Monroe City PWS |
15,600 | 3 | 1 | |
|
Trenton City PWS |
13,012 | 1 | 1 | |
|
New Miami Village PWS |
3,200 | 0 | 0 | |
|
Catalina Mobile Home Park |
1,280 | 1 | 1 | |
|
Seven Mile Village PWS |
1,000 | 1 | 1 | |
|
Crouse Mobile Home Park & Sales, LLC |
247 | 4 | 3 |
Non-community systems (9: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Fort Hamilton Hospital PWS |
950 | 1 | 0 | |
|
Molson Coors USA LLC |
550 | 0 | 0 | |
|
Cincinnati Childrens Hospt Liberty PWS |
313 | 0 | 0 | |
|
Advanced Drainage Systems Butler |
171 | 0 | 0 | |
|
AL Couch Super Market |
100 | 1 | 1 | |
|
Soul Winners Church |
75 | 2 | 1 | |
|
Naws Club LLC |
30 | 0 | 0 | |
|
Champion Camping Club PWS |
25 | 1 | 1 | |
|
Dollar General #16484 Seven Mile PWS |
25 | 0 | 0 |
Inactive systems (125, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Ohio records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.